Buzzfeed
55 websites

Buzzfeed is free to use

http://www.buzzfeed.com/

BuzzFeed is a website that combines a technology platform for detecting viral content with an editorial selection process to provide a snapshot of "the viral web in realtime"

VS

Foursquare Widget
128 websites

Foursquare Widget is free to use

https://developer.foursquare.com/

The foursquare API gives you access to all of the data used by the foursquare mobile applications, and, in some cases, even more.

Market Share by Top Websites

2 Buzzfeed is leading in Top 100K Sites.

Websites Categories

1 Foursquare Widget has better usage coverage in more websites categories. Including Travel & Tourism, Computers Electronics & Technology, News & Media, Food & Drink and 8 other categories.

2 Buzzfeed is leading in Arts & Entertainment, Hobbies & Leisure, Games, Adult and 3 other categories.

Geography

1 Foursquare Widget is leading in most countries, including United States, Russia, Spain, Italy and 27 other countries.

2 Buzzfeed is leading in Canada, Australia, Bahrain, South Korea and 2 other countries.